/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.spatial.prefix;
import org.locationtech.spatial4j.shape.Point;
import org.apache.lucene.spatial.prefix.tree.Cell;
import org.apache.lucene.spatial.prefix.tree.SpatialPrefixTree;
import org.apache.lucene.spatial.util.ShapeFieldCacheProvider;
import org.apache.lucene.util.BytesRef;
/**
* Implementation of {@link ShapeFieldCacheProvider} designed for {@link PrefixTreeStrategy}s that index points
* (AND ONLY POINTS!).
*
* @lucene.internal
*/
public class PointPrefixTreeFieldCacheProvider extends ShapeFieldCacheProvider<Point> {
private final SpatialPrefixTree grid;
private Cell scanCell;//re-used in readShape to save GC
public PointPrefixTreeFieldCacheProvider(SpatialPrefixTree grid, String shapeField, int defaultSize) {
super( shapeField, defaultSize );
this.grid = grid;
}
@Override
protected Point readShape(BytesRef term) {
scanCell = grid.readCell(term, scanCell);
if (scanCell.getLevel() == grid.getMaxLevels())
return scanCell.getShape().getCenter();
return null;
}
}